Style attribute applicability

This page reformats the relevant data in the TTML1 spec relating to style attributes' inheritance, relationship to parents, and applicability.

Namespaces are omitted for simplicity - most are in tts; multiRowAlign and linePadding are in ebutts.

Note that padding is defined by Tech3350 to apply to p in addition to region, but is only defined by TTML to apply to region.

The following "Relationship to parent" values are used to describe the interpretation of the attribute in relationship to the style defined on the parent element:

• none - a non-inherited attribute has no relationship to its parent element
• overwrites - an attribute overwrites the value of the style inherited from the parent element
• multiplies - an attribute modifies (by multiplication) the value of the style inherited from the parent element; this only applies to percentage values of the fontSize attribute

Attribute	Initial	Inherited	Relationship to parent	Applicable to	May be specified on
backgroundColor	transparent	no	none	body div p region span	style
color	n/a	yes	overwrites	span	style
direction	ltr	yes	overwrites	p span	style
displayAlign	before	no	none	region	region
extent	auto	no	none	tt region	tt, region
fontFamily	default	yes	overwrites	span	style
fontSize	1c	yes	overwrites unless %; if % then multiplies parent	span	style
fontStyle	normal	yes	overwrites	span	style
fontWeight	normal	yes	overwrites	span	style
lineHeight	normal	yes	overwrites	p	style
linePadding	0c	yes	overwrites	body div p	style
multiRowAlign	auto	yes	overwrites	p	style
origin	auto	no	none	region	region
overflow	hidden	no	none	region	region
padding	0px	no	none	region p span	region, style
showBackground	always	no	none	region	region
textAlign	start	yes	overwrites	p	style
textDecoration	none	yes	overwrites	span	style
unicodeBidi	normal	no	none	p span	style
wrapOption	wrap	yes	overwrites	span	style
writingMode	lrtb	no	none	region	region